Line lock mechanism, bell ringing means and margin release for typewriting machines



June 19, 1934. F. H.. TREGO 1,963,158

LINE LOCK MECHANISM, BELL RINGING' MEANS AND MARGIN RELEASE FOR TYPEWRITING MACHINES Filed March 22, 1930 s Sheets-Sheet 1 INVENTOR flan/HZ 771970.

By ATTORNEY June 19, 1934. F H TREGO 1,963,158

LINE LOCK MECHANISM, BEEL RINGING MEANS AND MARGIN RELEASE FOR TYPEWRITING MACHINES Filed March 22, 1930 5 Sheets-Sheet 2 E I fi n i R f 3; L Q Q'" Q 'q 4 Q I "llllllllllllllll a I QM /R BY I ATTORNEY June 19, 1934.

F. H. TREGO 1,963,158 LINE LOCK MECHANISM, BELL RINGING MEANS AND MARGIN RELEASE FOR TYPEWRITING' MACHINES Filed March 22, 1930 5 Sheets-Sheet 3 INVENTOR Fry/2th! Trego.

ATTORNEY June 19, 1934.

. F. H. TREGO 1 963,158 LINE LOCK :ECHANISM, BELL RINGING MEANS AND MARGIN I ELEASE FOR TYPEWRITING MACHINES Filed March 22, 1930 5 Sheets-$11eet 4 M 0 .Y, aw w m# WE n Kw w 6 M A U. u .4 M wr fi w l w /0/ 95 m June 19, 1934. F. H. TREGO 1,963,153

- LINE LOCK MECHANISM, BELL RINGING MEANS AND MARGIN RELEASE FOR TYPEWRITING MACHINES Filed March 22, 1930 5 Sheets-Sheet 5 INVENTOR frank/i Treqa BY W 2 Z ATTORNEY Patented June 19, 1934 UNITED STATES LINE LOCK MECHANISM, BELL BINGING MEANS AND MARGIN WRITING MACHINES RELEASE FOR TYPE- Frank H. Trego, New York, N. Y., assignor, by

mesne assignments, to Ralph C. Coxhead Corporation, New York, N. Y., a corporation of Delaware Application March 22, 1930, Serial No. 437,974 18 Claims. (Cl.1 9'l--112) This invention relates to typewriting machine and more particularly to line-lock mechanism, bell ringing means and margin release;

An object of the invention is to provide simple, substantial and efficient means which retains its working adjustment.

Another object of the invention is to locate the margin-stop, and the co-operating mechanism as near as possible to the base-plate of the main-frame so as to eliminate the possibility of disturbing the adjustment of said mechanism due to co-operation with the margin stops.

Features of the invention relate to novel construction of the line-lock mechanism and margin reease mechanism.

Other features and advantages will hereinafter appear.

In the drawings,

Fig. 1 is a sectional side view of the machine showing the invention applied thereto;

Fig. 2 is a fragmentary top plan view in section taken on the line 2-2 of Fig. 1;

Fig. 3 is a sectional rear view of the machine taken on the line 3--3 of Fig. 1;

Fig. 4 is a detail rear view showing the linelock mechanism moved to its locking position, at the end of a line, by one of the margin-stops on the carriage;

Fig. 5 is a view similar to Fig. 4 but showing the line-lock mechanism operated by the marginstop release-key;

Fig. 6 is a detail rear view, on a larger scale, of the right-hand margin-stop and showing the stop released from the stop bar to permit setting it along the bar;

Fig. 7 is a view similar to Fig. 6 showing the stop connected to the stop-bar;

Fig. 8 is a sectional view of the margin-stop taken on the line 8-8 of Fig. '1;

Fig. 9 is a front view of the right-hand marginstop on the stop-bar;

Fig. 10 is a sectional side view taken on the line 10--10 of Fig. 9;

Fig. 11 is a developed view of the kind of blank from which the bodies of both right-hand and left-hand margin-stops are formed;

Fig. 12 shows the b ank bent to form the body of one of the margin stops;

Fig. 13 is a s'milar view showing the blank bent to form the other margin-stop;

Fig. 14 is a view of the pawl used in either margin-stop;

Fig. 15 is a view of the blank from which the pawl operating lever of either margin stop may be formed;

Fig. 16 shows the lever blank bent for use in one of the margin-stops; and

Fig. 1'1 shows the lever blank bent for use in the other margin-stop.

Similar reference characters represent similar parts throughout the several views.

The invention is herein illustrated as applied to a Varityper writing machine which includes a main-frame 15 having secured thereto a rail 16 upon which is supported a carriage 17, having a bar 17*, to travel back and forth through the, medium of anti-friction balls or rollers 18 between the rail 16 and the bar 1'7.

The carriage is urged in a letter space direction (leftwardly in Fig. 2) by a spring drum 19, connected to the carriage 17 by a strap 20, and the letter space movements of the carriage are controlled by escapement mechanism, indicated generally by the numeral 21, which includes a pinion 22 engaging a rack 23 on said carriage.

Key-levers 25 when depressed swing about fulcrums 26 on the machine frame, their rear ends engaging a universal-bar 27 of a frame 28 pivoted by studs 29 on the machine frame 15. When the universal-bar frame 28 is actuated the free end of an arm 30 thereof moves downwardly to actuate a dog-rocker 31 of the escapement mechanism to'operate the latter and thus effect the letter-space movements of the carriage.

The carriage is provided with the usual feed rollers 32 and 33 by which a work-sheet 34 is fed upwardly with reference to the printing instrumentalities, not shown, operated by the keylevers 25. The carriage further includes end pieces 36, connected to each other by a guide bar 37, and a margin-stop bar 38; the latter being attached to said end pieces by screws 39.

Two margin-stops 40 and 41 are supported on the stop-bar 38 and co-operate with an abutment 42 supported on the machine frame 15 in aymanner hereinafter described. The stop 40 at the right-hand side of the rear view (Fig. 3) determines the margin at the left-hand end of the work-sheet and consequently will hereinafter be referred to as the left-hand marginstop; the other stop 4l'will be referred to as the right-hand margin-stop.

The abutment 42 is supported on a bar 43 which is herein supported for lateral movement, for a purpose hereinafter described, on the mainframe 15 by shouldered screws 43a threaded into posts 45 on a base plate 45* of the main-frame; the screws 43a passing through slots 43b in the bar 43; the bar 43 being normally held against the shanks of the screws 43a as shown in Fig. 3,

by a spring 44 connected to said bar in a man ner hereinafter described.

When the carriage is returned to begin a new line it ismoved leftwardly in Fig. 3 until a projection 46 of the stop 40 engages the abutment 42.

As the typing proceeds the carriage travels in the opposite direction (leftwardly in Fig. 2 and rightwardly in Fig. 3). When the carriage approaches the end of the line, a bell 47 is sounded to inform the typist that the end of the line is near. Subsequently the key-levers are locked against actuation in a manner described later.

To sound the bell 47 the right-hand marginstop 41 has thereon a projection 48 which engages a pawl 49 of a lever 50 to swing the latter about a pivot 51 and against the action of a re turn spring 52. As the stop 41 moves past and out of contact with the pawl 49 the lever 50 is snapped back by the spring 52 and is arrested by a fixed stud 53, thus causing a hammer 54 to strike the bell 47. The hammer 54 is supported on a spring wire arm 54a. secured to an arm 55, of the lever 50, by a screw 55a, and normally stands clear of the bell 47. It will be understood however that when the hammer lever 50 strikes the stop 53, the wire 54a yields, due to the momentum .of the hammer 54, and the latter strikes the bell. The hammer immediately springs back from the bell so as not to interfere with the sound thereof.

The pawl 49 is pivotally supported by a stud 56 on the bell lever 50 and is provided with an upwardly bent arm 57 which is held against the edge of the lever 50 by a spring 58; said arm limiting the movement of the pawl 49 about its pivot 56 in one direction, so that the hammer lever 50 may be operated by the margin-stop 41. When the carriage is returned from a position in which the margin-stop 41 is to the left of the pawl49 in, Fig. 2, the latter is engaged by projection 48 of the margin-stop and is swung about the pivot 56 against the action of the spring 58, thus permitting the return of the carriage without actuating the hammer 54.

After the bell 47 has been sounded, several characters may yet be typed and then, when the border of the right-hand margin is reached, the key-levers are automatically locked to temporarily prevent further typing. This locking of the keys is effected in the following manner. The projection 48 of the right-hand margin-stop 41 engages the abutment 42 to slide the bar 43 rightwardly in Fig. 3, thus carrying an obstructing element 60 (Fig. 3) into the path of a cross bar 61 (Fig. 4) of the universal frame 28, thus locking the universal-bar to prevent the operation of the key-levers 25; the locking of the universal-bar being effected within a single letter space movement of the carriage.

The obstructing element 60 is supported on a shouldered screw 62 threaded into the slide-bar 43 and is provided with an extension 63 held against a shoulder 64 of the slide-bar by a spring 65. Thus the obstructing element 60 is resiliently supported on the bar 43 to permit unobstructed movement of the slide-bar 43 should the movement of the latter start before the uni versal frame has returned to normal. In other .words, the element 60, if obstructed by the crossbar 61, yields against the action of the spring 65, thus permitt ng the bar 43 to be moved by the carriage. As soon as the universal-bar returns to normal, the obstructing element or pawl 60 snaps over the cross bar 61 to prevent further actuation of the universal frame 28. To compensate for variations in location or level of the cross-bar in the various machines with respect to the lower end of the obstructing pawl 60, the latter is provided with an inclined face 66. With this arrangement the engaging end of the pawl may move a greater or less extent over the cross-bar 61 according to the level or' horizontal position of said cross bar.

Line lock releasing mechanism is provided to permit, if desired, a few characters to be typed in the right-hand margin of the work-sheet after the carriage has been locked at the border of said margin. This mechanism includes a margin release-key which, when depressed, swings a lever 71 about the axis of a rock-shaft 72 to which said lever is secured; said rock-shaft being supported in the main-frame 15. A rearwardly-extending arm 73 is also secured tothe rock-shaft 72, the free end of said arm being moved upwardly when the key 70 is depressed. The arm 73 has mounted thereon a roller 74 which engages in a slot 75 of a release lever 76, to form a connection of the arm 73 with said release lever, so that the latter, by a depression of the margin release key 70, may be swung about a pivot stud 77 which supports the release lever on the bar 43. The slot 75 is elongated to permit freedom of transverse movement of the release lever 76, with the bar 43, relatively to the roller 74 during a line locking operation. While the release key is being depressed the roller 74 moves upwardly to swing the release lever 76 in a counter-clockwise direction (Fig. 3) to the position in Fig. 5 to withdraw the abutment 42 from the path of the projection 48 of the margin stop 41 against the action of a spring 78; connection between the release lever 76 and the abutment 42 comprising a stud 79 extending from the abutment into a slot 80 of said release lever. As soon-as the abutment is released the locking bar 43. is returned to normal, as in Fig. 5, by the spring 44 connected to the release lever 76, thus releasing the carriage and carrying the abutment under the projection 48 of the margin stop, and also carrying the obstructing pawl 60 out of the path of the crossbar 61 to unlock the key-lever 25 so that the few additional characters may be typed in the righthand margin.

After the few characters are typed in the margin the line-lock mechanism is again actuated to finally lock the carriage. To this end there may be provided on the carriage a fixed stud 81 (Figs. 1, 2 and 3) which engages the left-hand end of the lever 76 to push the locking bar rightwardly in Fig. 3 and thus carry the obstruction 60 into the path of the bar 61 to again lock the key-levers 25.

If it is desired to type in the left-hand margin the abutment 42 may be released fromthe projection 46, by operating the margin release key 70 as previously described. The carriage may then be positioned in the margin as desired. To

' limit the extreme leftward movement of the carriage in Fig. 3, after the projection 46 has moved sition by a stop or screw 86 which extends through a slot 8'7 in said lever; said screw having a head thereon to guide the free end of the release lever. The screw' 86 also limits the movement of the release lever to its operated position.

By an inspection of Fig. 5 it will be observed that due to the width of the abutment 42 the return of the latter to normal is prevented until the stop 41 rides clear of said abutment. Provis ion is made, however, to allow the release lever 76 to return immediately, or independently of the abutment 42. To this end the slot 80 is elongated vertically so that the lever 76 is unobstructed on its return by the spring 44. Another advantage of this construction including the stop screw 86, is that the pressure of the return spring 44 is not transmitted to the carriage. Consequently the feed of the carriage is not hindered by the action of the spring 44, the abutment 42 being restored to normal by the spring 78 which is comparatively light.

By an inspection of the drawings it will be seen that the stop bar 38 and the stops 40 and 41 are located at the front of the carriage where the stop may be readily reached for adjustment; that the locking bar 43 is located immediately beneath the stop bar; and that the locking bar 43 extends parallel to the stop bar and transversely over the universal frame. This arrangement produces a convenient, compact, economical and highly efficient line lock mechanism.

The margin stops 40 and 41 are adjustable lengthwise of the stop-bar 38 and may be set thereon at any letter space position. They are similar in construction, the stop 41 comprising an inverted U-shaped body portion 90. bent up from a blank 91 (Fig. 11), the arms 92 of which extend below the lower face of the stop-bar 38. A pawl 93 having formed on one face thereof projections or teeth 98 engaging between teeth 99 of the stop bar, is pivotally supported between the arms 92 on a stud 94 which is secured at the lower ends of the arms 92. The projection 48 is formed on the opposite face of the pawl and extends into the path of the abutment 42. A pawl operating lever 95 (Fig. 16) is formed from a blank 96 (Fig. 15). Said lever is pivoted on the stud 94 about which it may be swung by a finger-piece 9'7, in a counterclockwise direction (Fig. 7) to carry the teeth 98 of said pawl out of engagement with the co-operating teeth 99 on the margin stop bar 38, through the medium of a stud 100 secured to the pawl 93 and extending through a hole 101 in the lever 95. After the pawl 93 has been thus disengaged or released the stop may be adjusted to the desired position on the carriage by the assistance of a comitted directly to the stop bar through the pawl 93. Consequenly distortion of the body and shearing tendency on the pivot stud 94 is prevented.

To hold the lever 95 on the pivot stud 94 there may be provided a washer 104 (Fig. 8) which is secured to the outer end of said stud. The connecting stud 100 may be provided with a head 105 to prevent accidental disconnection of the lever 95 from said stud. A spacer 106, which may be in the form of a flange 106 on the stud 94, prevents of the stop body.

To assist in locating the margin-stop the stopbar 38 has thereon a scale 10'? which may be read through a slot 108 in the front arm 90 of the stop body; said arm having a pointer 109 formed thereon which extends into the slot 105 and over the scale 107;

The margin-stop 40 is constructed of the same parts which are identical with those of the stop 41 except that some of them, for example, the body vblanks 9l and the lever blanks 96, are bent oppositely to those of stop 41, see Figs. 12, 13 and 16, 1'7. The pawls 92, pivot studs 94, connecting studs 100 and springs 103 are identical in both stops. Except for the parts previously numbered the identical parts in both stops bear the same reference characters. Partsin the stop 40 similar to those in the stop 41 bear the same reference characters with the superscript a.

Thus it will be understood that the stops 40 and 41 are similar and that they are symmetrically arranged on the stop-bar 38 to engage on opposite sides of the abutment 42.

Novel features relating to the margin-stops undue rubbing of the lever 95 against the arm 92 shown herein are claimed in the divisional application Ser. No. 617,943, filed June 18, 1932.

While certain preferred embodiments of the invention have been shown and described, it will be understood that changes in the form, arrangements, proportions, sizes and details thereof may be made without departing from the scope of the invention as defined in the appended claims.

I claim:

1. In a typewriting machine, the combination of a main-frame, a carriage supported to travel back and forth thereon, key-levers, a universalbar operable by said key-levers, a margin-stop on said carriage settable to letter space positions lengthwise thereof, a bar disposed parallel to the carriage, devices to support said bar for endwise movement on the main-frame, and an abutment on said bar and engageable by the margin-stop to actuate said bar to lock the universal-bar against the actuation of the key-levers, one of said devices being efiective to limit the movement of said bar to lock the carriage.

2. In a typewriting machine, the combination of a main-frame, a carriage supported to travel back and forth thereon, key-levers, a imiversalbar operable by said key-levers, a margin-stop on said carriage, a slide bar supported for endwise movement on the main-frame, an abutment slide supported for transverse movement on said bar and engageable by the margin-stop to actuate said slide bar to thereby lock the universal-bar against the actuation of the key-levers, means to actuate said abutment slide to release it from the margin-stop so that the carriage may continue its feed, and means to return said slide bar to carry it out of engagement with the universalbar.

3. In a typewriting machine, the combination of a main-frame, a carriage supported to travel back and forth thereon, key-levers, a universalbar operable by said key-levers, an adjustable margin-stop on said carriage, a bar supported for endwise movement on the main-frame, an abutment on said bar and engageable by the margin-stop to actuate said bar to lock the universal-bar against the actuation of the keylevers, manual means including a key-lever on the main-frame to release said abutment from the margin-stop so that the carriage may continue its feed, means to return said bar to carry it out of engagement with the universal-bar, a signal device, and means supported independently of the margin-stop and operable by said margin-stop, prior to its engagementv with the abutment, to operate the signal device.

4. In a typewriting machine, the combination of a main-frame, a carriage supported to travel back and forth thereon, key-levers, a universalbar operable by said key-levers, a margin-stop on said carriage, a slide supported for endwise movement on the main frame, an abutment on said slide and engageable by the margin-stop to actuate said slide to lock the universal-bar against the actuation of the key-levers, a release lever supported by said slide, 'means to actuate said release lever to operate said abutment to release the latter from the margin-stop, and a single spring effective to return said slide and said release lever to normal.

5, In a typewriting machine, the combination of a main-frame, a carriage supported to travel back and forth thereon, key-levers, a universalbar operable by said key-levers, a margin-stop on said carriage, a bar supported for endwise movement on the main-frame, an abutment on said bar and engageable by the margin-stop to actuate said bar to lock the universal-bar against the actuation of the key-levers, a release lever pivoted on said bar, and an operating lever on the machine frame to actuate said release lever to operate said abutment to release it from the I margin-stop, and a single spring to return the bar, the release lever and the operating lever to normal. g

6. In a typewriting machine, the combination of a main-frame, a carriage supported to travel back and forth thereon, key levers, a' universal bar operable by said key levers, a margin stop on said carriage, a locking bar, studs on the main-frame to slidingly support the locking bar, a lug carried by the locking bar, said locking bar being actuable by said margin stop to carry the lug of said locking bar into the path of the universal bar to lock the latter, means to release said locking bar from said margin stop,

and means to return said bar to normal after its release to carry the lug out of the path of the universal bar to thus unlock. said universal bar, the supporting studs being also effective to limit the motion of the locking bar.

'7. In a typewriting machine, the combination of a main-frame, a carriage supported to travel back and forth thereon, key-levers, a universalbar frame operable by said key-levers, a stopbar on said carriage, a margin-stop on said stopbar, a bar independent of the stop-bar extending lengthwise of the carriage and slidingly supported on the main frame, an abutment on said bar to be engaged by said margin-stop to actuate the bar in the direction of travel of the carriage, and a resilient element supported by said bar to be carried into the path of the universal-bar frame to prevent actuation of the latter by the keylevers.

8. In a. typewriting machine, the combination of a main-frame, a carriage supported to travel back and forth thereon, key-levers, a universalbar frame operable by said key-levers, a marginstop on said'carriage, a horizontal bar supported for endwise movement on the main-frame in the direction of travel of the carriage, a cooperative element supported for vertical movement on said bar to be engaged by the margin-stop to actuate said bar, a projection on said bar carried into the path of the universal-bar frame to lock it,

a spring to hold said co-operating element in its effective position, means on the bar to actuate said co-operating element vertically against the action of said spring ,to releaseit from the margin-stop, and means to restore said bar to normal to unlock the universal bar.

9. In a typewriting machine, the combination of a main-frame, a carriage supported to travel back and forth thereon, key-levers, a universalbar frame movable upwardly by said key-levers, a marginstop settable on said carriage to various letter space positions, and a locking bar located above the universal bar frame and extending lengthwise of the carriage, means to slidingly support the locking bar on the mainframe, the locking bar being engageable by the margin-stop to move the locking bar into cooperative relation with the universal bar frame to lock the latter during the travel of the carriage.

10. In a typewriting machine, the combination of a main-frame, a carriage supported to travel back and forth thereon, key-levers, a universalbar operable by said key-levers, a margin-stop on said carriage, a locking bar slidingly sup-.

ported on the main frame in a direction parallel to the'travel of the carriage, an arm pivoted on said locking-bar, a stop for said arm, a spring connected to said arm and said bar to hold said arm against said step, said locking-bar being operable by said margin-stop to carry said arm into the path of the universal-bar to lock it against actuation by said key-levers, said arm being adaptable to yield against the action of its spring if obstructed by the universal-bar in case the movement of said locking-bar is effected before the universal bar is returned to normal.

.11. In a typewriting machine, the combination of a main-frame, a carriage supported to travel back and forth thereon, key-levers, a universalbar operable by said key-levers, a margin-stop on said carriage, a bar supported on the main-frame and movable endwise by the margin-stop to lock the universal-bar, a co-operating element on said bar and engaged by the margin stop, a spring acting between said bar and said co-operating element, to hold the later in the path of the marginstop, a release-lever pivoted on said bar, a keylever to actuate said release lever to actuate said co-operating element to withdraw it from engagement with the margin-stop, means on said bar to be engaged by the release-lever to limit its motion when operated by the key-lever, and a single spring to return the bar, the release-lever and its associated key lever to normal.

12. In a typewriting machine, the combination of a main-frame, a carriage supported to travel back and forth thereon, key-levers, a universalbar operable by said key-levers, a margin-stop on said carriage, a bar supported on the main frame for bodily movement in the direction of travel of the carriage, a co-operating element on said bar, a release lever on said bar, said release lever having an elongated slot, said stop to engage said co-operating element to actuate saidlever on the manually operable lever, the elongat-' I ed slotpermitting freedom of movement of the release lever with the said bar relatively to the manually operable lever.

13. In a typewriting machine, the combination of a main frame, a carriage to travel back and forth thereon, a margin stop on said carriage, key-levers on the main frame, a universal frame operable by the key levers, a bar slidably supported on the main frame, an obstructing member on said bar capable of direct engagement with the'universal frame to lock the latter, a lug on said bar to be engaged by the margin stop to slide the bar to carry the obstruction into co-operative relation with the universal frame to lock the latter against actuation by the key-levers, manually operated means to actuate the lug independently of the bar to withdraw said lug from the path of the margin stop, and a spring to return the bar to unlock the universal frame.

14. In a typewriting machine, the combination of a main frame, a carriage to travel back and forth thereon, a stop bar'supported on and located at the front of the carriage, margin stops on said bar, key levers on said main frame, a universal frame operable bythe key levers, a locking bar supported on the main frame for movement parallel to the carriage, said locking bar being located above the universal frame and beneath said stop bar, the portion of the universal bar over which the locking bar extends having an upward movement when operated by any one of the key levers, an abutment on the locking'bar and ried by the locking bar to actuate the abutmentto withdraw it from the path of the last mentioned margin stop.

15. In a typewriting machine, the combination of a main frame, a carriage to travel back and forth thereon, a stop bar supported on and located .at the front of the carriage, margin stops on said bar, key levers on said main frame, a universal frame operable by the key levers, a locking bar supported on the main frame for movement parallel to the carriage, said locking bar being located above the universal frame and beneath said stop bar, the portion of the universal bar over which the locking bar extends having an upward movement when operated by any one of the key levers, an abutment on the locking bar and located near the middle of the machine, said abutment being engageable by one of the margin stops to arrest the carriage in its initial writing position, an ob-' structing member extending downwardly from the locking bar, the other margin stop being effective to engage the abutment to move the locking barin the direction of feed of the carriage to carry the obstructing device into effective relation with the universal frame to lock thekey levers, a margin release Iever of the first order supported on the main frame at one side of the machine and extending fore-and-aft thereof and a sub-lever of the first order pivoted on the looking bar and connected to the release lever to be actuated by the latter, the sub-lever extending transversely from the release lever to the abutment to withdraw the latter from the path of the margin stop.

16. In a typewriting machine, the combination of a main frame, a carriage to travel thereon, a stop on said carriage for the right-hand margin of a work-sheet, key levers, means including a baron the main frame to lock the key levers, said bar having an abutment thereon to be engaged by the margin stop to actuate the bar to lock the key levers, a lever supported on said bar to withdraw the abutment from the path of the stop to permit the return of the locking bar to unlock thev key-levers and also permit the carriage to enter the margin, and a fixed stop on said carriage to engage the end of said lever to subsequently actuate the bar to again lock the key levers and to limit the movement of the carriage in the letter feed direction.

17. In a typewriting machine, the combination of a main frame, a carriage to travel thereon, a stop bar on said carriage, a stop on said stop bar, key levers, a universal frame operable by said key'levers, a locking bar located under the stop bar and extending parallel thereto and transversely of the universal frame, an abutment on the locking bar to be engaged by the stop to move the locking bar to its locking position, said abutment being movable vertically on the locking bar to withdraw it from the path of the stop, a return spring for said abutment, a release lever on said locking bar to actuate said abutment, a spring connected to said release lever and effective to return said lever and said locking bar to normal, said release lever having a vertically elongated slot therein, and a projection on said abutment extending into said slot to form a connection between the release lever and the abutment, the slot being sufficiently long to permit the return of the release lever independently while the latter i'sheld depressed by the margin stop, and a stop for thereturn movement of the release lever to prevent the action of the connected spring from working against the margin stop through the medium of the abutment. a

18. In a typewriting machine, the combination of a carriage, a margin stop therefor, key levers, and line lock mechanism for the key levers including a locking bar, the locking bar having a slot therein, an abutment element located in said slot, a release lever pivotally supported on the locking bar to actuate the abutment element to withdraw it from the path of the margin stop, said release lever being'eifective to hold the abutment element in said slot, a spring to return the abutment element to normal, and a projection on said abutment element to arrest it in its normal position on the locking bar.

- FRANK H. TREGO. 

